Xaras
What I mean is that he betrayed Xemnas, The Superior, all for some loser traitor named Roxas.
True...... However, if you remember the whole story plot, you should remember that some of the Organization ask Sora to come back to them because Sora looks like Roxas. And in addition, thanks to the newest video, I've seen the part that it was Saix's idea that Axel "betrayed" the Organization before the CoM began and the part before Roxas quit the Organization.